Tempol protects blood proteins and lipids against peroxynitrite-mediated oxidative damage

Ayman G. Mustafa, Mohammad A. Bani-Ahmad, Ahmad Q. Jaradat, Mohammed Z. Allouh

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Oxidative stress is characterized by excessive production of various free radicals and reactive species among which, peroxynitrite is most frequently produced in several pathological conditions. Peroxynitrite is the product of the superoxide anion reaction with nitric oxide, which is reported to take place in the intravascular compartment. Several studies have reported that peroxynitrite targets red blood cells, platelets and plasma proteins, and induces various forms of oxidative damage. This in vitro study was designed to further characterize the types of oxidative damage induced in platelets and plasma proteins by peroxynitrite. This study also determined the ability of tempol to protect blood plasma and platelets against peroxynitrite-induced oxidative damage. The ability of various concentrations of tempol (25, 50, 75, and 100 µM) to antagonize peroxynitrite-induced oxidation was evaluated by measuring the levels of protein carbonyl groups and thiobarbituric-acid-reactive substances in experimental groups. Exposure of platelets and plasma to 100 µM peroxynitrite resulted in an increased levels of carbonyl groups and lipid peroxidation (P < 0.05). Tempol significantly inhibited carbonyl group formation in plasma and platelet proteins (P < 0.05). In addition, tempol significantly reduced the levels of lipid peroxidation in both plasma and platelet samples (P < 0.05). Thus, tempol has antioxidative properties against peroxynitrite-induced oxidative damage in blood plasma and platelets.

Original languageEnglish
Pages (from-to)109-112
Number of pages4
JournalExperimental Biology and Medicine
Volume240
Issue number1
DOIs
Publication statusPublished - Jan 17 2015
Externally publishedYes

Keywords

  • Carbonyl groups
  • peroxynitrite
  • plasma
  • platelets
  • tempol
  • thiobarbituric acid

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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